Yes, screen resolution does have an impact. If you are using too high a resolution GoTo will chop of the bottom portion of all your slides and in some cases it will also chop off the right side too. Please refer to a separate discussion that deals with GoTo chopping of part of the slides.
This sort of thing should be checked during practice sessions, but you should be able to see during the event if someone's screen resolution is causing a problem.
The difficulty is that just agreeing to a consistent resolution for all presenters is not enough. How the slides appear (and what may or may not be chopped off) is determined by the default resolution for the PC, not the resolution you all agree to use. For example if each person presenting uses a pc with a different maximum resolution, the resolution you need to change down to for the slide to all appear correctly will be different for each presenter's pc.